Review on 🔬 Enhanced OTC 5025 Diesel Exhaust Fluid (DEF) Refractometer by Conrad Greene

I use this every time I get a DEF. The only time I've bought a bad DEF was it found out. Without a tester I could fill my truck with bad DEF. Before purchasing this refractometer, I had a DEF specific gravity tester. It was a lot cheaper, but half the time it was hard to tell which reading it was; it was contradictory. The refractometer is much better and only takes a minute.